112 



Proceedings of the Royal Society of Victoria. 



Hydrocaulus about one-third of an inch in lieight, nionosi- 

 phonic, unbranched ; stem-internodes long, pinna? alternate, not 

 close, one or two on an internode of the stem ; a hydrotheca on 

 each internode of the pinnaj ; joints of stem and pinnje very 

 oblique. Hydrothecae nearly parallel with the pinnse in their 

 proximal portion, distal part curved upwards, aperture somewhat 

 oblong, margin free, not widely ever ted at the sides ; a strong in- 

 trathecal ridge springing from the front wall of the hydrotheca, a 

 little below the lip, and extending rather more than half across 

 the cavity of the cell. A single sarcotheca below each hydro- 

 theca, fixed, erect, upper portion forming a concave shield facing 

 the hydrotheca. A sarcostyle in the angle between the back of 

 each hydrotheca and the pinna, not provided with a sarcotheca, 

 but partly protected on each side by a very narrow web which 

 connects the pinna with the back of the hydrotheca. Cauline 

 sarcothecae one (conical in form) at the base of each pinna, and 

 one in each axil, sometimes an additional one on the stem- 

 internode. 



Gonangia flattened on one side, by which they are adnate to 

 the substance on which the colony is attached, a few irregular 

 indistinct transverse undulations on the upper side, aperture sub- 

 terminal, without any distinct marginal ring or operculum. 



Colour. — Yellowish. 



Hab. — Queenscliff", Williamstown, Portland, Port Jackson. 



This species, though closely allied to K. mirahilis in its more 

 mportant features, differs from it entirely in its dwarf habit, its 

 adnate gonothecjv, and, to a certain extent, in the form of the 

 hydrotheca, which is here somewhat more recurved, so that the 

 distal and proximal portions become closely united in the front, 

 forming the ordinary intrathecal ridge, instead of leaving a space 

 to be tilled up with solid perisarc, as in K. mirabilis. The hydro- 

 thecee, however, are rather variable in form, and in some specimens 

 the lip projects strongly, and the angle just below it, along with 

 the constriction which marks the origin of the intrathecal ridge, 

 is filled up by chitinous matter, which in my specimens was 

 evidently not of dense consistence, as it shrivelled on immersion 

 in balsam ; indeed the whole polypidom is of fragile texture, and 

 generally shrivels more or less on drying, or on immersion in a 



